Pin-puller



J. DITSON.

PIN FULLER.

APPLICATION FILED JULY 6. 1920. 1

1,393,094. Patented Oct 11,1921.

UNITED STATES PATENT OFFICE.

JESSE DITSQN, or LITTLETQN, cononeno, assrenon r0 rnennsonnn-e rrz COMPANY, OF JERSEY CITY, NEW JERSEY, A oonroaa'riorzr on NEW. JERSEY.

PIN-PULLER.

Patented Oct. 11,1921.

application filed July 6, 1920 Serial No. 394,2e6. 1

To all whom it may concern.

Be it known that I, JnssnDrrsoN, a citizen of the United States, residing at Little ton, in the county of Arapahoe and State of Colorado, have invented a certain new and useful Improvement in Pin-Pullers, of which the following is a specification.

This invention relates to pin pullers and particularly to a device of this character arranged to operate in conjunction with a drill sharpening machine to withdraw the pin from a'hot drill steel, usually inserted into the bore of the steel to restore the bore to its proper diameter.

In present day mining drills, it is usual to provide the drill steel witha central hole extending throughout its length; for the purpose of supplying air under pressure, and water, to the cutting edges of the bit-to force the debris away from the cutting edges and also to prevent overheating and the formation or" dust. In resharpening a drill bit of the type above referred to the metal displaced, flowing andbeing forced into the hole in the drill bit at every blow of the sharpening or forming tool and the hole thus soon becomes reduced or completely closed as the walls of the hole are closed in. It is customary to force a pin into the end of the drill by any suitable means so that the pin penetrates into the hole and reopens the hole to its proper diameter. However, these pins frequently become tightly wedged in the'hole, thus necessitating the use of a pin puller to withdraw the pin. Such pin pullers have been provided either as separate machines or as anadjunct to the drill sharpening machine proper, operated independentlyeither by hand or foot power or by separate mechanical means, I

The primary object of the present invention is to enable a pin puller to be'conveniently mounted on astationary portion of a drill steel sharpening machine and opera tively connected to a movable member of the drill sharpener, so that the pin puller is operated by said movable member of the drill sharpener, instead of by separate or independent manual means.

Furtherobjects of the invention will hereinafter appear andto all of these ends the invention consists of the combination of elements and arrangement of parts substantially as hereinafter fully described in this specification and shown in the accompanying drawings, in which, r i I F ig."2 is an end view of the device, and

Fig. 3 is a top plan view.-

Referring to the drawings, A represents the base or cylinder of a drill sharpener having the vertically'movable member or crosshead B carried by the plunger rod C adapted to be actuated by a piston (not shown) operating in the base or cylinder. The vertically movable member or crosshead B forms suitable and convenient means for imparting the required move ments to the pin puller.

The pin puller shown in this instance comprises the frame D having the abutment E and adapted to be suitably secured to a stationary portion of the drill sharpener as by means of the bolts F. If desired, a depend ingarm G may be provided on the pin puller frame and secured to a convenient portion of the drill sharpener in this instance the arm G being secured over the exhaust pipe H.

The pin puller is provided with a horizontally movable jaw carrying member J adapted to slide in the guides K and L on the frame D. A gripping jaw O is fixedly carried by the jaw carrier J in this instance the jaw 0 being provided with a screw threaded stem P threaded into the end of jaw carrier J. Another cooperating jaw Q, is pivoted to a yoke R at S and said yoke is in turn pivoted to the jaw Q at T. The yoke R maybe provided with a hook U at its lower end, adapted to be engaged by a rod V extending through guide lugs W. A spring X surrounds the rod V and is adapted to be further compressed between lugs Wand a stop pin Y at the end of the rod V when the jaw carrier J is 'moved toward the abutment E. 'As the jaw carrier J is moved away from the abutment E the expansion of the spring X tends to rock the yoke R on the pivot T and clamp the jaws O and Q upon the pin a which is to be pulled from the drill steel 5, abutting against-the abutment E, in this instance the bit end of a drill steel being shown in position against the abutment E. The abutment is preferably provided with a flared opening or recess j in which the end of the drill steel 6 is adapted to rest and an aperturec joining the re e 1' into which t lower pp g jaw 0 may moved toward the abutment. The limit of inward movement is reached when the yoke R lies flat against the abutment E. In such position the jaws O and Q are at the maximum distance apart and the pin a extending" away from the abutment E by the movement of a movable member of the drill sharpener, as for instance, the crosshead B. In order to operatively connect the jaw carrier J with the crosshead Ban arm a is plvotally con-.

nected'to the jaw carrier at f and removably attached at the other end to the crosshead B, as by means of the pin 9 carried by r the crosshead over which the recess II in the arm 6 is fitted. By this means the arm E said pin puller inoperative.

may .be disconnected from the crosshead when desired.

In the operation of the device the drill sharpener is actuated by motive fluid under pressure controlled by-the usual throttle (not shown) and the movement of the crosshead B actuates the jaw carrier J toward and away from the abutment E. As the jaw carrier moves away from the abutment E the pin a is gripped by the jaws O and Q1 and pulled out of the drill steel.

I claim:

1. A pin puller for pulling a pin from an object, adapted to be mounted on a stationary portion of a drill steel sharpening machine, said pin puller comprising a vertically movable crosshead forming part oi" the drill sharpening machine, a stationary abutment, a jaw carrying member adapted to move toward and away from saidabutment, a pin gripping jaw fixedly carried by said member, another pin gripping jaw pivotally attached to said first mentioned jaw and means connected, in operative rela tion with said crosshead of the drill sharpener for actuating said jaw carrying member toward and awaytrom said abutment by the movement of said crosshead, said means being adapted to be disconnected to render 2. A pin puller for pulling a pin from an object adapted'to be mounted on a station ary portion of a drill steelsharpening machine, said pin puller comprising'a vertically movable crosshead forming part of the drill sharpening machine, a stationary abutment, a jaw carrying member adapted to inove toward and away from said abutment, a pin gripping jaw fixedly carried by said member, another pin gripping jawpivotally attached to said first named jaw, an arm pivoted to said jaw carrying member at one end, the other end of said arm being deextendas the jaw carrier J is tachably connected-to said. crosshead of the drill sharpener, whereby said'jaw carrying member is actuated toward and away from said abutment by the movement of said crosshead. 4

3. A pin puller for pulling a pin from an object, adapted to be mounted on a station ary portion or a drill steel sharpening machine, said. pin puller comprising a vertically movable crosshead forming a part ofthe drill sharpening; machine, a stationary abut ment, ajaw carrying member adapted to move toward and away from said abutment, pin gripping-jaws carried by saidmember and operative means for actuatingsaid'jaw carrying member toward and away tron: said abutment by the movement 01" said crosshead, said means comprising an arm pivoted to :said jaw carrying member, at one end, the other end being detachably con nected to said crosshe-ad and adapted to be disconnected to render the pin puller in operative. I

4. In combination with a] drill sharpener havin 'a base and a movable crosslieail, a

pin pullenframe mounted on said base,-

pin grasping means slid-able in said frame. detachable means connecting said pin grasping means with the crosshead for actu atingthe-pin grasping means to grip and pull a pin when the crosshead moves in one direction, said pin grasping means being inoperative during movement of the crosshead when said connecting means are detached from the crosshead.

Inv combination with a drill sharpener having a'base and a movable crosshead, a pin puller-irame mounted on;saidibase,.;a stationary abutment, grippingjawscarried on a member slidable in said frame, an arm pivoted to said jaw carrier and removably attached to said crosshead above-said gripping-jaws for'movingsaid jaws away from said abutment and simultaneouslygripping and pulling a pin when-said crosshead moves in one direction and moving said jaws, toward saidtabutment when said crosshead moves in the other direction, said gripping jaws being-idle when-said arm is detached from said jcrosshead.

6. In'combination;with a drill sharpener having abase and a vertically movable crosshead,a pin pulleivframe rigidly mounted' on said base, a stationary abutment, a gripping jaw holder horizontally slidable on said'frame, gripping jawsemounted on said holder, an armpivoted to said jaw holder' and removablyattached to said crossheadfor moving said jaws away fromsaid abutment and simultaneously gripping and pulling-a pin when said crosshead moves in one direction, and toward said abutment when'said" erosshead moves in the other direction, said gripping? jaws; being idle when sa d a m is detached from said crosshead and swung on its pivot to a position below said jaws.

7. A pin puller for pulling a pin from an object adapted to be mounted on a stationary portion of a drill steel sharpening machine, said pin puller comprising a vertically movable crosshead forming part of a drill sharpening machine, an abutment for the said object, gripping jaws for gripping the pin and operative means detachably connected to the crosshead for causing relative movement between said abutment and jaws toward and away from each other by the movement of said crosshead, said means be ing adapted to be detached from the crossheadto render the pin puller inoperative during movement of the'crosshead.

8. In combination with a drill sharpener having a base, a crosshead vertically movable in said base, a pin puller frame rigidly mounted on said base, said pin puller comprising a stationary abutment, a jaw carrying member adapted to move toward and away from said abutment, pin gripping jaws carried by said member, an arm pivoted to said jaw carrying member at one end, the other end of said arm being adapted to be detachably connected to said vertically movable crosshead whereby said jaw carrying member is actuated toward said abutment by the movement of said crosshead in one direction and away from said abutment by movement of said crosshead in the opposite direction, said jaw members being idle during movement of the crosshead when the arm is disconnected from the crosshead.

9. A pin puller for pulling a pin from an object adapted to be mounted on a drill steel sharpening machine, said pin puller comprising a stationary abutment, a jaw carrying member adapted to move toward and away from said abutment, a pin gripping jaw fixedly carried by said member, a yoke pivoted to said fixedly carried jaw, another pin gripping jaw pivotally attached to said yoke, constantly acting means enward and away from said abutment, a pin gripping j aw fixedly carried by said member, a yoke pivoted to said fixedly carried jaw, another pin gripping jaw pivotally attached to said yoke, means engaging said yoke for rocking it on its pivot to clamp'said jaws on the pin, an arm pivoted to said jaw carrying member at one end, the other end of said arm being adapted to be detachably connected to said vertically movable crosshead, whereby said jaw carrying member is actuated toward and away from said abutment b movement of said crosshead.

11. n a pin puller for pulling a pin from an object adapted to be mounted on a stationary portion of a drill sharpening machine, said drill sharpening machine having a movable crosshead, a stationary abutment against which a drill steel is adapted to rest, clamping means comprising horizontally movable clamping jaws adapted to securely grasp a pin and means operated by the crosshead of the drill sharpeningmachine and engaging said clamping means for moving said clamping means toward and away from said abutment, said means being adapted to be withdrawn from operative engagement with said crosshead to render said clamping means inoperative during movement of the crosshead.

In testimony whereof I have signed this specification.

JESSE DITSON, 

